PROBLEM TO BE SOLVED: To provide a surface modification method for a rubber vulcanizate or a thermoplastic elastomer, which can impart excellent sliding properties and durability against repeated sliding motion and can allow the surface to maintain the sealing properties, without using expensive self-lubricating plastics.SOLUTION: The present invention relates to a surface modification method for modifying a rubber vulcanizate or a thermoplastic elastomer as an object to be modified, the method including: a step 1 of allowing a photopolymerization initiator to be adsorbed on a surface of the object to be modified and a step 2 of radically polymerizing monomers, starting from the adsorbed photopolymerization initiator, by irradiation with UV light at a wavelength of 300 nm to 400 nm to grow polymer chains on the surface of the object to be modified.COPYRIGHT: (C)2014,JPO&INPIT【課題】高価な自己潤滑性を有する樹脂を使用することなく、優れた摺動性、及び摺動の繰り返しに対する耐久性を付与し、かつシール性も維持できる加硫ゴム又は熱可塑性エラストマーの表面改質方法を提供する。【解決手段】加硫ゴム又は熱可塑性エラストマーを改質対象物とする表面改質方法であって、前記改質対象物の表面に光重合開始剤を吸着させる工程1と、前記吸着させた光重合開始剤を起点にして、300nm~400nmのUV光を照射してモノマーをラジカル重合させ、前記改質対象物の表面にポリマー鎖を成長させる工程2とを含む表面改質方法に関する。【選択図】なし
